package Dame;

import java.util.*;
import java.util.stream.Stream;

public class test2 {
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        Stream<String> listStream = list.stream();

        Set<String> set = new HashSet<String>();
        Stream<String> setStream = set.stream();

        Map<String,Integer> map = new HashMap<>();
        Stream<String> mapStream = map.keySet().stream();

    }
}
